Rotary pump.



No. 730,081. v PATENTED'JUNE 2, 1903.

F. G'. BATES. ROTARY PUMP.

A-PPLIOATION'IILED NOV.18, 1901. i no MODEL. i s SH-E-ETSSH-BE-T-1.

PATENTED' JUNE '2, 1903.

F.--G. BATES.

ROTARY PUMP.

APPLIOATION FILED nov. 18, 1901.

3 SHEETS-SHEET 2.

im MODEL.

PATENTED JUNE 2, 1903.

F. G. BATES. ROTARY PUMP.

APPLICATION FILE!) NOV. 18, 1901.

3 SHEETS-SHEET 3.

H0 MODEL .m km

UNITE STATES Patented June 2, 190 3.

ATENT QFFIGE.

ROTARY PUMP.

SPECIFICATION formingpart of Letters Patent N 0. 730,081, dated June 2, 1903.

Application filed November 18, 1901. Serial No. 82,727. (No model.) i

To all whom, itvnaty concern.-' u Be it known that I, FRANCIS G. BATES, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in RotaryPumps, of which the following is a specification.

One object of my invention is to construct a rotary pump of improved form in which a full area of'opening'or discharge, or both, is provided for each-of the pistons when the pump is of the duplex or multiple type, and a still further object being to simplify and cheapen the construction of the pistons. These objects I attain in the manner hereinafter set forth, reference being had to the accompanying drawings, in which Figure 1 is a transverse section of a rotary pump constructed in accordance with my invention. Fig.2 is a longitudinal section of the. same, partly on the line a, Fig. l, and partly on the line b, Fig. 1, the piston and piston-shaft being shown in elevation; and Fig. 3 is a sectional view of the piston-shaft and its two pistons.

1 represents the cylinder or casing of the pump, which in the present instance is of the duplex type, being bored out on each side of a central partition 2, so as to receive a rotatingpiston 3, which is eccentric in respect to the shaft 4, one of the pistons being set at one hundredand eighty degrees in respect to the other and each piston having rigidly secured upon it asleeve 5, providing a bearing for a series of rollers 6, the latter carrying an outer ring 7, which constitutes the contactring of the piston, and as the eccentric portion of the-latter rotates is caused to rock or oscillate, so as to bring all portions of its periphery successively in contact with the bore of the chamber in which it works. My invention is, however, applicable to pumps having rotating pistons of other types.

Each ring 7 carries laterally expanded packings 9, which bear, respectively, against the partition 2 and against the opposite heads 10 of the cylinder, so as to prevent leakage at either end of either piston.

Communication between the piston-chamber on opposite sides of the point of contact of the piston-ring 7 with the cylinder is prevented by a slidingplate 11, which has at its incap'15, which has a central partition 16, re-

ceiving the upper portions of the guides 14 for the sliding plate 11,'said partition, in connection with these guides, serving to form in duction and eduction passages for each of the piston-chambers of the pump, each induction and eduction passage being divided by a horizontal partition 17 into two portions. Thus the portion of the induction-passage above the partition is represented at 19 and the portion below the same at 19 ,whi1e the upper portion of the eduction-passage is represented at 20 and the lower portion of the same at 20*.

The partition 17 has a number of ported seats 21 for induction-valves 22 and eductionvalves 23, the induction valves being contained in the portion 19 of the inductionpassage and opening toward the piston-chambers and the eduction-valves being contained in the portion 20 of the eduction-passage and opening away from the piston-chambers, each valve being normally kept closed against its seat by means of a coiled spring 24, inter-. posed between the valve and a cap 25, car.- ried by a stud or spindle 26, which projects from the valve-seat. These valves thus serve to prevent backflow of fluid from the eduction-passage into the cylinder or from the latter into the induction-passage when the motion of the pistons is suddenlyarrested from any cause.

Each piston-chamber'is in communication with all of the induction and eduction valves by reason of the formation of openings 27 in the partition 2, so that each piston can draw through the ports of all of the'induction valve seats and discharge through the ports of all of the eduction-valve seats, easy flow of the liquid to and from the pistonchambers being thereby insured and interferonce with the operation of the pump due to excessive friction upon the fluid being prevented. The same construction can of course be applied to pumps having more than two piston-chambers.

Each of the eccentric pistons is, as shown in Fig. 3, provided with a flange 30 at its innor end, which flange serves as a stop for the sleeve 5, which is seated firmly upon the piston and is prevented from rotating independently thereof by means of a key 31, as shown in Fig. 1.

Each of the sleeves 5 has at its inner end a flange 32, which serves as a stop for one end of each of the series of rollers 6 and also for one end of the piston-ring 7, the rollers and.

piston-ring being retained in the opposite direction by means of a ring 33, screwed upon the end of the sleeve 5, as shown in Fig. 3. By this means a ready fitting together of the parts is facilitated, the piston being introduced from one end of the cylinder structure, and in the case of a duplex pump one of the pistons passing through an opening 35,formed in the central partition 2, so that the parts carried by one piston can be introduced through one end of the cylinder and those carried by the other piston can be introd need through the opposite end of the cylinder before applying the heads 10.

v The piston-shaft has a central oil-supply passage 36, with radial branches 37, leading to the raceway for the antifriction-rollers 6, and the bearing-hub on each of the heads 10 of the cylinder carries a split bearing 39 for the piston-shaft and has awell 40, into which dips an oil-supplying ring 41, resting upon the shaft and serving to deliver oil to a lateral passage 42, leading to the central oil way or duct of the shaft, as shown in Fig. 3.

Having thus described my invention, I claim and desire to secure by Letters Patent- 1. A cylinder having two or more pistonchambers, each with rotary piston and sliding separator-plate, and also with induction and eduction passages each divided by a partition having ported valve-seats to which are adapted self-closing induction and eduction valves, the induction and eduction passage of each piston-chamber bein'gin free communication with the corresponding induction or eduction passage of another piston chamber or chambers, substantially as specified.

2. The combination of the eccentric piston with the sleeve surrounding the same and secured thereto, said sleeve having a flange at one end, the piston-ring, the series of rollers interposed between the same and the sleeve, and a ring secured to said sleeve and serving to confine the piston-ring and rollers longitudinally between it and the flange of the sleeve, substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

- FRANCIS G. BATES.

Witnesses:

F. E. BECHTOLD, J 0s. H. KLEIN. 

